IOTA/IOTA-ES occultation update for (894) Erda / UCAC4-431-108907 event on 2023 May 14, 09:27 UT Visible from South America Summary ------- On 2023 May 14 UT, the 37.3 km diameter asteroid (894) Erda will occult a 11.8 mag star in the constellation Aquila for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.07 mag to 14.81 mag (the magnitude of the asteroid) for at most 3.350 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 78 * date and approx. time of event: 2023 May 14, 09:23 - 2023 May 14, 09:42 * geocentric midpoint of event [JD]: 2460078.89779875 * magnitude of target star: 11.81 * magnitude drop [mag]: 3.07 * estimated maximum duration [s]: 3.350 * Moon: 30 % sunlit, 43° distance * Sun: 106° distance * rough path description: South America Additional comments ------------------- 3" double star The occultation path -------------------- * approximate projected width [km]: 38 * 1 sigma uncertainty interval [path widths]: +/- 0.70 * 1 sigma uncertainty interval [seconds]: +/- 3.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.027", 0.004", 82°) * approx speed of asteroid's shadow [km/s]: 11.1330 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-431-108907 by 894 Erda on 2023 May 14 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude -159 0 0 -33 44 47 9 23 24.5 1 94 -68 -33 55 1 -33 34 33 -34 9 25 -33 20 7 .... -158 0 0 -33 48 7 9 23 24.7 1 94 -69 -33 58 20 -33 37 53 -34 12 44 -33 23 28 -0.09 -157 0 0 -33 50 50 9 23 25.0 2 93 -70 -34 1 3 -33 40 37 -34 15 26 -33 26 12 -0.12 -156 0 0 -33 52 57 9 23 25.3 3 93 -70 -34 3 10 -33 42 45 -34 17 33 -33 28 20 -0.13 -155 0 0 -33 54 29 9 23 25.9 4 92 -71 -34 4 41 -33 44 16 -34 19 4 -33 29 52 -0.14 -154 0 0 -33 55 24 9 23 26.5 5 91 -71 -34 5 36 -33 45 11 -34 19 59 -33 30 47 -0.14 -153 0 0 -33 55 43 9 23 27.2 6 91 -72 -34 5 55 -33 45 31 -34 20 18 -33 31 7 -0.14 -152 0 0 -33 55 26 9 23 28.1 6 90 -72 -34 5 38 -33 45 14 -34 20 1 -33 30 49 -0.15 -151 0 0 -33 54 33 9 23 29.1 7 90 -73 -34 4 45 -33 44 20 -34 19 8 -33 29 56 -0.15 -150 0 0 -33 53 4 9 23 30.2 8 89 -73 -34 3 16 -33 42 50 -34 17 40 -33 28 26 -0.15 -149 0 0 -33 50 58 9 23 31.5 9 89 -73 -34 1 11 -33 40 44 -34 15 35 -33 26 19 -0.15 -148 0 0 -33 48 15 9 23 32.9 10 88 -74 -33 58 29 -33 38 2 -34 12 53 -33 23 36 -0.15 -147 0 0 -33 44 56 9 23 34.3 11 88 -74 -33 55 11 -33 34 42 -34 9 36 -33 20 15 -0.15 -146 0 0 -33 41 1 9 23 36.0 11 87 -74 -33 51 15 -33 30 46 -34 5 42 -33 16 18 -0.16 -145 0 0 -33 36 28 9 23 37.7 12 86 -75 -33 46 43 -33 26 12 -34 1 11 -33 11 44 -0.16 -144 0 0 -33 31 18 9 23 39.6 13 86 -75 -33 41 35 -33 21 2 -33 56 3 -33 6 32 -0.16 -143 0 0 -33 25 31 9 23 41.6 14 85 -75 -33 35 48 -33 15 14 -33 50 18 -33 0 43 -0.16 -142 0 0 -33 19 6 9 23 43.7 15 85 -75 -33 29 25 -33 8 48 -33 43 55 -32 54 16 -0.16 -141 0 0 -33 12 4 9 23 46.0 16 84 -75 -33 22 23 -33 1 44 -33 36 56 -32 47 10 -0.16 -140 0 0 -33 4 23 9 23 48.4 16 84 -75 -33 14 44 -32 54 3 -33 29 18 -32 39 27 -0.16 -139 0 0 -32 56 4 9 23 50.9 17 83 -75 -33 6 26 -32 45 42 -33 21 2 -32 31 5 -0.16 -138 0 0 -32 47 7 9 23 53.6 18 83 -75 -32 57 30 -32 36 43 -33 12 8 -32 22 4 -0.16 -137 0 0 -32 37 30 9 23 56.4 19 82 -75 -32 47 54 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5 -19 2 20 -18 2 35 -0.17 -100 0 0 -17 53 5 9 27 40.9 56 70 -49 -18 5 33 -17 40 35 -18 23 7 -17 22 58 -0.17 - 99 0 0 -17 12 43 9 27 51.0 57 70 -48 -17 25 16 -17 0 9 -17 42 57 -16 42 25 -0.17 - 98 0 0 -16 31 24 9 28 1.4 58 70 -47 -16 44 2 -16 18 45 -17 1 50 -16 0 54 -0.17 - 97 0 0 -15 49 8 9 28 11.9 59 70 -46 -16 1 51 -15 36 24 -16 19 46 -15 18 26 -0.17 - 96 0 0 -15 5 55 9 28 22.8 61 70 -45 -15 18 43 -14 53 6 -15 36 46 -14 35 1 -0.17 - 95 0 0 -14 21 46 9 28 33.8 62 71 -44 -14 34 39 -14 8 52 -14 52 48 -13 50 39 -0.17 - 94 0 0 -13 36 40 9 28 45.1 63 71 -43 -13 49 39 -13 23 41 -14 7 55 -13 5 22 -0.17 - 93 0 0 -12 50 39 9 28 56.7 64 72 -42 -13 3 43 -12 37 35 -13 22 6 -12 19 9 -0.17 - 92 0 0 -12 3 43 9 29 8.4 65 73 -40 -12 16 51 -11 50 34 -12 35 22 -11 32 0 -0.17 - 91 0 0 -11 15 53 9 29 20.4 67 73 -39 -11 29 6 -11 2 39 -11 47 43 -10 43 58 -0.17 - 90 0 0 -10 27 9 9 29 32.7 68 74 -38 -10 40 27 -10 13 50 -10 59 11 - 9 55 2 -0.17 - 89 0 0 - 9 37 33 9 29 45.1 69 75 -37 - 9 50 56 - 9 24 9 -10 9 47 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0 2 13 48 9 32 42.2 81 133 -20 1 59 33 2 28 2 1 39 31 2 48 9 -0.16 - 75 0 0 3 12 16 9 32 56.5 81 142 -19 2 57 59 3 26 33 2 37 52 3 46 43 -0.16 - 74 0 0 4 11 1 9 33 10.9 81 151 -17 3 56 42 4 25 20 3 36 32 4 45 34 -0.15 - 73 0 0 5 10 0 9 33 25.3 80 159 -16 4 55 39 5 24 22 4 35 27 5 44 38 -0.15 - 72 0 0 6 9 10 9 33 39.6 80 167 -15 5 54 47 6 23 33 5 34 33 6 43 51 -0.15 - 71 0 0 7 8 26 9 33 53.9 79 173 -13 6 54 3 7 22 51 6 33 46 7 43 11 -0.15 - 70 0 0 8 7 46 9 34 8.2 78 179 -12 7 53 21 8 22 12 7 33 3 8 42 33 -0.15 - 69 0 0 9 7 6 9 34 22.4 77 184 -11 8 52 40 9 21 32 8 32 21 9 41 55 -0.15 - 68 0 0 10 6 21 9 34 36.5 76 188 -9 9 51 55 10 20 48 9 31 35 10 41 11 -0.15 - 67 0 0 11 5 29 9 34 50.5 75 191 -8 10 51 3 11 19 56 10 30 43 11 40 19 -0.15 - 66 0 0 12 4 25 9 35 4.4 74 194 -7 11 49 59 12 18 52 11 29 40 12 39 15 -0.15 - 65 0 0 13 3 7 9 35 18.1 72 197 -5 12 48 42 13 17 33 12 28 23 13 37 56 -0.15 - 64 0 0 14 1 31 9 35 31.7 71 199 -4 13 47 6 14 15 56 13 26 48 14 36 17 -0.15 - 63 0 0 14 59 33 9 35 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26 40 10 9 38 18.1 54 217 13 26 26 23 26 53 57 26 6 59 27 13 24 -0.14 - 49 0 0 27 28 40 9 38 28.1 52 218 14 27 14 57 27 42 22 26 55 39 28 1 44 -0.14 - 48 0 0 28 16 16 9 38 37.7 51 218 15 28 2 38 28 29 54 27 43 25 28 49 9 -0.14 - 47 0 0 29 2 57 9 38 47.0 50 219 16 28 49 24 29 16 32 28 30 17 29 35 40 -0.14 - 46 0 0 29 48 44 9 38 56.1 49 220 17 29 35 15 30 2 14 29 16 15 30 21 16 -0.14 - 45 0 0 30 33 35 9 39 4.9 48 221 18 30 20 11 30 47 0 30 1 17 31 5 56 -0.14 - 44 0 0 31 17 31 9 39 13.4 47 221 19 31 4 11 31 30 51 30 45 24 31 49 40 -0.14 - 43 0 0 32 0 30 9 39 21.7 45 222 20 31 47 14 32 13 45 31 28 34 32 32 28 -0.14 - 42 0 0 32 42 32 9 39 29.6 44 223 21 32 29 22 32 55 43 32 10 48 33 14 19 -0.14 - 41 0 0 33 23 39 9 39 37.3 43 224 22 33 10 33 33 36 45 32 52 6 33 55 14 -0.14 - 40 0 0 34 3 49 9 39 44.8 42 224 23 33 50 48 34 16 50 33 32 28 34 35 13 -0.14 - 39 0 0 34 43 3 9 39 52.0 41 225 24 34 30 7 34 55 59 34 11 53 35 14 15 -0.14 - 38 0 0 35 21 21 9 39 58.9 40 226 25 35 8 30 35 34 13 34 50 23 35 52 21 -0.14 - 37 0 0 35 58 43 9 40 5.6 39 226 26 35 45 57 36 11 30 35 27 57 36 29 32 -0.14 - 36 0 0 36 35 11 9 40 12.1 38 227 27 36 22 29 36 47 53 36 4 36 37 5 48 -0.14 - 35 0 0 37 10 44 9 40 18.3 37 228 28 36 58 7 37 23 21 36 40 21 37 41 9 -0.14 - 34 0 0 37 45 22 9 40 24.3 36 229 28 37 32 50 37 57 55 37 15 11 38 15 36 -0.14 - 33 0 0 38 19 7 9 40 30.1 35 229 29 38 6 40 38 31 35 37 49 7 38 49 10 -0.14 - 32 0 0 38 51 59 9 40 35.6 34 230 30 38 39 37 39 4 22 38 22 10 39 21 51 -0.14 - 31 0 0 39 23 59 9 40 40.9 33 231 31 39 11 41 39 36 17 38 54 21 39 53 39 -0.14 - 30 0 0 39 55 7 9 40 46.1 32 231 32 39 42 54 40 7 21 39 25 40 40 24 36 -0.14 - 29 0 0 40 25 24 9 40 51.0 31 232 32 40 13 15 40 37 33 39 56 8 40 54 42 -0.14 - 28 0 0 40 54 50 9 40 55.7 30 233 33 40 42 46 41 6 55 40 25 46 41 23 58 -0.14 - 27 0 0 41 23 28 9 41 0.3 29 233 34 41 11 28 41 35 28 40 54 33 41 52 24 -0.14 - 26 0 0 41 51 16 9 41 4.6 28 234 35 41 39 20 42 3 12 41 22 32 42 20 2 -0.14 - 25 0 0 42 18 16 9 41 8.8 28 235 35 42 6 25 42 30 8 41 49 43 42 46 52 -0.14 - 24 0 0 42 44 29 9 41 12.8 27 236 36 42 32 42 42 56 17 42 16 6 43 12 55 -0.14 - 23 0 0 43 9 56 9 41 16.7 26 236 37 42 58 13 43 21 39 42 41 42 43 38 11 -0.14 - 22 0 0 43 34 37 9 41 20.3 25 237 37 43 22 58 43 46 16 43 6 33 44 2 42 -0.14 - 21 0 0 43 58 32 9 41 23.9 24 238 38 43 46 57 44 10 8 43 30 38 44 26 29 -0.14 - 20 0 0 44 21 44 9 41 27.2 23 239 39 44 10 13 44 33 15 43 53 59 44 49 31 -0.14 - 19 0 0 44 44 12 9 41 30.4 23 239 39 44 32 45 44 55 40 44 16 37 45 11 50 -0.14 - 18 0 0 45 5 58 9 41 33.5 22 240 40 44 54 34 45 17 21 44 38 31 45 33 26 -0.14 - 17 0 0 45 27 1 9 41 36.4 21 241 40 45 15 41 45 38 21 44 59 43 45 54 21 -0.14 - 16 0 0 45 47 23 9 41 39.2 20 241 41 45 36 7 45 58 40 45 20 14 46 14 35 -0.14 - 15 0 0 46 7 5 9 41 41.9 19 242 42 45 55 52 46 18 18 45 40 4 46 34 8 -0.14 - 14 0 0 46 26 7 9 41 44.4 19 243 42 46 14 57 46 37 17 45 59 13 46 53 2 -0.14 - 13 0 0 46 44 29 9 41 46.8 18 244 43 46 33 23 46 55 36 46 17 44 47 11 16 -0.14 - 12 0 0 47 2 13 9 41 49.1 17 244 43 46 51 10 47 13 17 46 35 36 47 28 53 -0.14 - 11 0 0 47 19 20 9 41 51.3 16 245 44 47 8 20 47 30 20 46 52 49 47 45 52 -0.14 - 10 0 0 47 35 49 9 41 53.3 16 246 44 47 24 52 47 46 46 47 9 26 48 2 14 -0.14 - 9 0 0 47 51 41 9 41 55.3 15 247 45 47 40 47 48 2 36 47 25 25 48 17 59 -0.14 - 8 0 0 48 6 58 9 41 57.1 14 247 45 47 56 6 48 17 49 47 40 48 48 33 9 -0.14 - 7 0 0 48 21 39 9 41 58.8 14 248 46 48 10 50 48 32 28 47 55 36 48 47 44 -0.14 - 6 0 0 48 35 45 9 42 0.5 13 249 46 48 24 59 48 46 31 48 9 48 49 1 43 -0.14 - 5 0 0 48 49 17 9 42 2.0 12 250 47 48 38 33 49 0 1 48 23 26 49 15 9 -0.14 - 4 0 0 49 2 15 9 42 3.4 11 250 47 48 51 34 49 12 57 48 36 30 49 28 2 -0.14 - 3 0 0 49 14 40 9 42 4.8 11 251 48 49 4 1 49 25 19 48 49 1 49 40 21 -0.14 - 2 0 0 49 26 32 9 42 6.0 10 252 48 49 15 55 49 37 9 49 0 58 49 52 8 -0.15 - 1 0 0 49 37 52 9 42 7.2 9 253 48 49 27 17 49 48 27 49 12 23 50 3 22 -0.15 0 0 0 49 48 40 9 42 8.2 9 254 49 49 38 7 49 59 12 49 23 16 50 14 5 -0.15 1 0 0 49 58 56 9 42 9.2 8 254 49 49 48 25 50 9 27 49 33 37 50 24 17 -0.15 2 0 0 50 8 41 9 42 10.1 7 255 50 49 58 13 50 19 10 49 43 27 50 33 58 -0.15 3 0 0 50 17 56 9 42 10.9 7 256 50 50 7 29 50 28 23 49 52 45 50 43 8 -0.15 4 0 0 50 26 40 9 42 11.7 6 257 50 50 16 15 50 37 6 50 1 34 50 51 49 -0.15 5 0 0 50 34 55 9 42 12.3 5 257 51 50 24 31 50 45 19 50 9 52 50 59 59 -0.15 6 0 0 50 42 40 9 42 12.9 5 258 51 50 32 18 50 53 2 50 17 41 51 7 41 -0.15 7 0 0 50 49 55 9 42 13.4 4 259 52 50 39 35 51 0 17 50 25 0 51 14 53 -0.15 8 0 0 50 56 42 9 42 13.8 3 260 52 50 46 22 51 7 2 50 31 49 51 21 36 -0.15 9 0 0 51 3 0 9 42 14.2 3 260 52 50 52 42 51 13 19 50 38 10 51 27 51 -0.15 10 0 0 51 8 50 9 42 14.4 2 261 53 50 58 32 51 19 7 50 44 2 51 33 38 -0.15 11 0 0 51 14 11 9 42 14.6 2 262 53 51 3 55 51 24 27 50 49 26 51 38 57 -0.16 12 0 0 51 19 4 9 42 14.8 1 263 53 51 8 49 51 29 20 50 54 22 51 43 48 -0.17 13 0 0 51 23 30 9 42 14.8 0 264 53 51 13 15 51 33 45 50 58 49 51 48 12 -0.21 Uncertainty in time = +/- 4 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4-431-108907 * constellation : Aquila * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 21 11.7228 DE: -03 53 16.434 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 21 11.7229 DE: -03 53 16.433 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (894) Erda asteroid class: approx. diameter [km]: 37 approx. diameter ["]: 0.022 distance from Earth [AU]: 2.34410 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#61 date of fit: 2023 Apr 24 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.027", 0.004", 82.154° remarks: * orbital elements for (894)Erda : Mean anomaly = 342.5940674491 deg Arg. of pericenter = 116.8644140883 deg Long. of node = 190.5903867160 deg Inclination = 12.7379017600 deg Eccentricity = 0.1101746657 Semimajor axis = 3.1171558111 AU Perihelion dist = 2.7737242116 AU Mag: H = 9.71, G = 0.15 Epoch of elements : MJD 60078.39375000 TDT (2023 May 14.3937) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#612023Apr24,3.35,2023,5,14,9.547170,-0.104298,0.113613,4.633152,4.244998,-0.005161,-0.001692,0.000000,0.000000 -69.4749,-3.8158,35.88,18.61,False UCAC4-431-108907,20.35325630,-3.8878983,0.00,11.81,0.00,0.0,0,,20.37363833,-3.8158434,1.21,0.00,1,0,1 894,Erda,14.81,37.3,2.3441,0,0,1.161,15.93,,2.0,0 0,342.5236,2023,5,14,116.8644,190.5904,12.7379,0.11017,3.11716,2.77372,9.72,5.0,0.15 1.705,0.0267,0.0037,82,0.0155,Known errors,-1.00,-1,-1,-1 20230514_108907,60063.18 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:25 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org